How to install a software in Ubuntu with a .deb file?
administrator@administrator-VirtualBox:/tmp$ sudo apt-get -i SmartclassCTS.deb
[sudo] password for administrator:
E: Command line option 'i' [from -i] is not understood in combination with the other options.
You either can install it via dpkg which really has the option -i for installing like so:
sudo dpkg -i SmartclassCTS.deb
Or you can use apt for that with the install option:
sudo apt install ./SmartclassCTS.deb
Or as an alternative to dpkg which not resolves dependencies you can use gdebi which is not installed by default but you can find it in the universe repositories:
sudo apt update
sudo apt install gdebi
sudo gdebi SmartclassCTS.deb
